I'd have to go with what I call 'standard shonen,' which is basically a shonen series that is, to me, really formulaic to the point of being extremely predictable. They usually involve the main character developing some incredible power at some point and using it to defeat an enemy he couldn't defeat otherwise, but then he can't control it very well and either nearly dies or nearly kills a comrade or an innocent person. Later, he's suddenly able to control that power perfectly, but there's little to no reason why.
As the series goes on, characters either develop or reveal powers that are more and more technical, to the point of being either too convenient, overpowered, or seemingly really good but with some small technical flaw that allows a battle to continue for way too long.
Finally, just when it seems the latest enemy is as strong as they come, another enemy appears and is at least ten times tougher than the last one, to the point where the MC doesn't stand a chance until the whole cycle repeats itself all over again.
I guess I've just grown tired of this formula over time.
Examples: Naruto, Bleach, Fairy Tail

So... what happens if one dude wants a lot of girls, does that make him a man-whore or ambitious?

That would be the perverted best friend character in the harem show. The main character is actually some sort of sexually deficient male that either can't figure out that all these girls like him or is to afraid of sex to do anything anyway. The perverted best friend wants all the girls, but they revile him as the disgusting pervert that he is and usually heap physical abuse upon him, or at least the tsundere characters do...

I dislike many shonen anime (mainly from Weekly Shonen Jump with a couple of exceptions: Bakuman, Gintama, Love Hina and Reborn!) since most likely it's the same thing and a lot of them get overrated and they tend to get boring over time (Naruto Shippuden, that case it's the fillers).